<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        
    </style>
</head>
<body>
    
</body>
<script>

    var str1 = "hello";
    var str1_1 = "hello";
    console.log(str1 === str1_1);
    
    var str2 = new String("hello");
    var str2_1 = new String("hello");
    console.log(str2 === str2_1);

    console.log(str1);
    console.log(typeof str1);

    console.log(str2);
    console.log(typeof str2);

    console.log(str1 + 1);

    console.log(str2 + 1);

    console.log( "hello" + 1 )
    
    console.log( {} + 1 )
    
</script>
</html>